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    diff

    diff command for MoonX.

    command-line
    moonx
    wasm
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    Version
    0.2.0
    License
    Apache-2.0
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    Last updated
    16 hours ago
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    59

    #diff

    Version 0.2.0 behavior is documented here. The support record separates local verification from published MoonX behavior; moonx examples use registry releases.

    Compare two files or directories, using - for stdin. Normal output identifies inserted, deleted and changed lines; -u/-U selects unified output and -c/-C selects context output, with three context lines by default.

    moonx cli/diff old.txt new.txt
moonx cli/diff -u --label old --label new old.txt new.txt

    -q/--brief reports differences without a patch. -s/--report-identical-files reports equal files. -a/--text treats NUL-containing inputs as text, preserving NUL and malformed UTF-8 bytes. Repeated --label options set the displayed left and right names, including brief, identical and binary reports.

    -i/--ignore-case compares ASCII letters without case. -w/--ignore-all-space ignores C whitespace within each line; -b/--ignore-space-change collapses whitespace runs and ignores trailing whitespace. -Z/--ignore-trailing-space ignores trailing whitespace only. Those whitespace modes also ignore the missing final line-feed distinction. -B/--ignore-blank-lines suppresses a change group only when every changed line is blank under the selected comparison rules; it does not remove blank lines before comparison. Unified/context hunks containing another substantive change retain the blank changes.

    --strip-trailing-cr removes one CR immediately before each LF, including displayed lines; a CR in an unterminated final line remains. Other comparison transformations preserve the original displayed bytes. Comparison keys are prepared once, separately from the input records.

    Directory entries are processed in C byte order. Without -r/--recursive, common subdirectories are reported without descent. -N/--new-file compares missing sides as empty; --unidirectional-new-file does so only for a missing left side. A file paired with a directory selects the corresponding basename in that directory. Recursive traversal uses public path resolution to detect ancestor loops. Directory/file type differences and directory FIFO/socket pairs are reported like the fixed GNU profile. Top-level readable special files are compared as input streams. Directory character/block device pairs require device-number metadata; the same resolved path is equal, while other pairs remain an explicit device-number capability boundary. Symlinks follow their public filesystem targets; comparing link-target text itself remains outside this profile. Path messages use C-locale shell escaping, while automatic unified/context header names use C quoting. Explicit --label text remains unchanged.

    Exit status is 0 for identical files, 1 for a difference, and 2 for an input or option error. Directory errors retain earlier output and do not hide errors behind later successful entries. Non-C locale collation is outside this release. Timestamp headers honor TZ, TZDIR, 64-bit TZif transitions and explicit POSIX DST rules, including dates after 2038. With no TZ, the host's /etc/localtime is used. Missing timezone data is an error. Unified output uses ISO timestamps and context output uses the traditional weekday/month/day format. Use --label for stdin or hosts without a timezone database. --help and --version are available. Both files and their comparison keys remain buffered. Edit reconstruction uses bidirectional Myers frontiers and an explicit partition stack with O(N+M) auxiliary space, excluding input/key bytes and the produced edit/output records. Records without a possible counterpart bypass the edit search. Equivalent-line change alignment joins neighboring changes and exercises the registered GNU repeated-line cases. This is neither constant-memory diff nor a linear-time guarantee for high edit density.

    #Standalone metadata

    Standalone --version prints exactly diff 0.2.0 followed by one newline. Standalone --help starts with Usage: diff, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

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